JP2010043714A - Suck back valve - Google Patents

Suck back valve Download PDF

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Publication number
JP2010043714A
JP2010043714A JP2008209762A JP2008209762A JP2010043714A JP 2010043714 A JP2010043714 A JP 2010043714A JP 2008209762 A JP2008209762 A JP 2008209762A JP 2008209762 A JP2008209762 A JP 2008209762A JP 2010043714 A JP2010043714 A JP 2010043714A
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Prior art keywords
valve
opening
suck back
suck
closing
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JP2008209762A
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JP5247298B2 (en
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Atsushi Inoue
淳史 井上
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Surpass Industry Co Ltd
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Surpass Industry Co Ltd
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Priority to JP2008209762A priority Critical patent/JP5247298B2/en
Priority to EP09167283.2A priority patent/EP2157343B1/en
Priority to KR1020090074074A priority patent/KR101555382B1/en
Priority to US12/541,581 priority patent/US8251345B2/en
Publication of JP2010043714A publication Critical patent/JP2010043714A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K23/00—Valves for preventing drip from nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
    • F16K31/1221—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston one side of the piston being spring-loaded

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Driven Valves (AREA)
  • Coating Apparatus (AREA)
  • Details Of Valves (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suck back valve provided with a suck valve function in an opening and closing valve. <P>SOLUTION: The suck back valve SV includes a suck back chamber 17 formed in a passage in the opening and closing valve 10, a piston shaft part 33 for connecting an opening, closing and pressing member 40 axially moving in the sack back chamber 17 for pressing a valve body 11 to a piston body 31 and bellows 41 accommodating the piston shaft part 33 to separate an actuator 30 from the passage in the valve and having one end connected to the opening, closing and pressing member 40 and the other end supported by a casing 12. The suck back valve carries out a two-stage operation including a valve opening stage that when the valve body 11 is closed, the piston shaft part 33 moves to a completely closed position of the valve 11 together with the piston body 31 and the opening, closing and pressing member 40 and a suck back action stage that the piston shaft part 33 and the opening, closing and pressing member 40 further move from the completely closed position to increase a space volume of the suck back chamber 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、開閉弁の全閉操作時に液だれが生じることを防止するサックバック機能を備えたサックバックバルブに関する。   The present invention relates to a suck back valve having a suck back function for preventing dripping from occurring when the on-off valve is fully closed.

従来、たとえば薬液等の液体を取り扱う配管系統に設置される開閉弁においては、全閉操作時に生じる液だれ（流体のボタ落ち）を防止するため、別体のサックバック専用バルブを併設することが行われている。このようなサックバック専用バルブは、開閉弁の閉動作に同期して作動するものであり、サックバック室の空間容積を増す方向へダイヤフラムを動作させることにより、出口側の液体をサックバック室側に吸引して液だれを防止することができる。（たとえば、特許文献１参照）
特開２００２−３１６０８５号公報 Conventionally, on-off valves installed in piping systems that handle liquids such as liquid chemicals, for example, a separate dedicated suck-back valve has been added to prevent dripping (fluid dripping) that occurs during a fully closed operation. Has been done. Such a suck back dedicated valve operates in synchronization with the closing operation of the on-off valve. By operating the diaphragm in the direction of increasing the space volume of the suck back chamber, liquid on the outlet side is sucked into the suck back chamber side. It is possible to prevent dripping by suction. (For example, see Patent Document 1)
JP 2002-316085 A

しかしながら、上述した従来のサックバック専用バルブは、開閉弁とサックバック専用バルブとが別体であるから、装置全体としての設置スペースが大きくなるという問題を有している。
また、開閉弁及びサックバック専用バルブは、各々が空気圧等を用いたアクチュエータにより動作させるものであるから、両アクチュエータを同期させて液だれを確実に防止することは困難であった。 However, the above-described conventional suck back dedicated valve has a problem that the installation space of the entire apparatus is increased because the on-off valve and the suck back dedicated valve are separate bodies.
Further, since the on-off valve and the suck back dedicated valve are each operated by an actuator using air pressure or the like, it has been difficult to reliably prevent dripping by synchronizing both actuators.

さらに、ダイヤフラムを用いたサックバックバルブは、サックバック室に大きなデッドスペースが形成されることから、液体の置換性が悪いという問題を有している。しかも、ダイヤフラムを用いたサックバックバルブは、ダイヤフラムの動作によるサックバック室の容積変化率が小さいため、大容量のサックバック量を実現するためには巨大なサックバック室が必要となるため現実的ではない。   Furthermore, the suck back valve using a diaphragm has a problem that liquid displaceability is poor because a large dead space is formed in the suck back chamber. Moreover, the suck-back valve using a diaphragm is realistic because the volume change rate of the suck-back chamber due to the operation of the diaphragm is small, and a huge suck-back chamber is required to realize a large-capacity suck-back amount. is not.

このような背景から、設置スペースの低減や同期の問題を解決するため、開閉弁にサックバック機能を備えたサックバックバルブ、すなわち、開閉弁とサックバック専用バルブとを一体化したサックバックバルブが求められている。また、このようなサックバックバルブにおいては、サックバック室のデッドスペースをなくして流体の置換性を増すとともに、サックバック可能な流体の容量を増すことができるサックバック構造が望ましい。
本発明は、上記の事情に鑑みてなされたものであり、その目的とするところは、開閉弁にサックバルブ機能を備えたサックバックバルブを提供することにある。 Against this background, in order to solve the problem of reduced installation space and synchronization, there is a suck back valve that has a suck back function in the open / close valve, that is, a suck back valve that integrates an open / close valve and a special suck back valve. It has been demanded. Further, in such a suck back valve, it is desirable to have a suck back structure that can eliminate the dead space of the suck back chamber and increase the fluid replacement property and increase the capacity of the fluid that can be sucked back.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a suck back valve having a suck valve function in an on-off valve.

本発明は、上記の課題を解決するため、下記の手段を採用した。
本発明に係るサックバックバルブは、弁体を開閉方向に付勢する弾性部材を備えた開閉弁が、ピストン本体及びピストン付勢部材を備えている開閉操作部に流体圧力を受けて弁体開閉操作を行うとともに、全閉操作時の液だれを防止するサックバック機能を備えているサックバックバルブであって、前記開閉弁の弁内流路に形成したサックバック室と、前記サックバック室内を軸方向に移動して前記弁体を押圧する開閉押圧部材と前記ピストン本体との間を連結しているピストン軸部と、前記ピストン軸部を内部に収納して前記開閉操作部を前記弁内流路から分離し、一端が前記開閉押圧部材に連結されるとともに他端がケーシングに支持されているベローズとを備え、前記弁体の閉動作時には、前記ピストン軸部が前記ピストン及び前記開閉押圧部材とともに前記弁体の全閉位置まで移動する閉弁動作段階と、前記ピストン軸部及び前記開閉押圧部材が前記全閉位置からさらに移動して前記サックバック室の空間容積を増すサックバック動作段階との二段階動作を行うものである。 In order to solve the above problems, the present invention employs the following means.
In the suck back valve according to the present invention, the on-off valve having an elastic member for urging the valve body in the opening / closing direction receives the fluid pressure on the opening / closing operation unit having the piston body and the piston urging member, and opens / closes the valve body. A suck back valve having a suck back function for performing a manipulation and preventing dripping at the time of a fully closed operation, wherein a suck back chamber formed in a flow path in the valve of the on-off valve, and the suck back chamber An opening / closing pressing member that moves in the axial direction and presses the valve body, and a piston shaft portion that connects the piston body, and the piston shaft portion is housed in the piston shaft portion so that the opening / closing operation portion is placed in the valve And a bellows having one end connected to the opening / closing pressing member and the other end supported by the casing. The piston shaft portion is connected to the piston and the opening when the valve body is closed. A valve closing operation stage that moves to the fully closed position of the valve body together with the pressing member, and a suck back operation that further moves the piston shaft and the opening / closing pressing member from the fully closed position to increase the space volume of the suck back chamber. A two-stage operation with a stage is performed.

このような本発明のサックバックバルブによれば、開閉弁の弁内流路に形成したサックバック室と、サックバック室内を軸方向に移動して弁体を押圧する開閉押圧部材とピストン本体との間を連結しているピストン軸部と、ピストン軸部を内部に収納して開閉操作部を弁内流路から分離し、一端が開閉押圧部材に連結されるとともに他端がケーシングに支持されているベローズとを備え、弁体の閉動作時には、ピストン軸部がピストン及び開閉押圧部材とともに弁体の全閉位置まで移動する閉弁動作段階と、ピストン軸部及び開閉押圧部材が全閉位置からさらに移動してサックバック室の空間容積を増すサックバック動作段階との二段階動作を行うようにしたので、ひとつのアクチュエータで弁の開閉及び液だれ防止のサックバックを行うことができる。
そして、サックバック室の空間容積を増すサックバック動作段階では、開閉操作部を液体から分離しているベローズが有する軸方向の大きな伸縮機能により、ピストン軸部及び開閉押圧部材が軸方向に移動するストローク量（移動量）を容易に確保して空間容積の増加量を増すことができ、サックバック室の容量のほとんどをサックバック量とすることができる。また、このようなベローズの採用は、サックバック室をベローズが埋めるため、デッドボリュームをなくすことができる。 According to such a suck back valve of the present invention, the suck back chamber formed in the flow path in the valve of the on / off valve, the opening / closing pressing member that moves in the suck back chamber in the axial direction and presses the valve body, and the piston body A piston shaft part that is connected between the two, and the piston shaft part is housed inside to separate the opening / closing operation part from the flow path in the valve, and one end is connected to the opening / closing pressing member and the other end is supported by the casing. The valve shaft is moved to the fully closed position of the valve body together with the piston and the opening / closing pressing member when the valve body is closed, and the piston shaft portion and the opening / closing pressing member are in the fully closed position. Since the two-stage operation is performed with the sac-back operation stage that increases the space volume of the sac-back chamber by moving further from the valve, the valve can be opened and closed and the sac-back can be prevented from dripping with a single actuator. Can.
In the suck back operation stage in which the space volume of the suck back chamber is increased, the piston shaft portion and the opening / closing pressing member move in the axial direction by the large axial expansion / contraction function of the bellows separating the opening / closing operation portion from the liquid. The stroke amount (movement amount) can be easily secured to increase the amount of increase in the space volume, and most of the capacity of the suck back chamber can be set as the suck back amount. Also, the use of such a bellows can eliminate dead volume because the bellows fills the suck back chamber.

上記の発明において、前記弁体の下流側に形成される前記弁内流路の出口流路は、前記サックバック室の底面に形成した凹部を通ることが好ましく、これにより、弁内流路を流れる流体はサックバック室を通ることなく流出する。従って、サックバック室には、弁体の閉動作時に液体が残留するようなデッドスペースは存在しないこととなる。   In the above invention, the outlet flow path of the intra-valve flow path formed on the downstream side of the valve body preferably passes through a recess formed in the bottom surface of the suck back chamber. The flowing fluid flows out without passing through the suck back chamber. Therefore, there is no dead space in the suck back chamber in which liquid remains when the valve body is closed.

上記の発明において、前記ピストン軸部の軸方向動作量を規制するサックバック量調整手段を設けることが好ましく、これにより、諸条件に応じて適宜サックバック量を調整して最適化することができる。   In the above invention, it is preferable to provide a suck back amount adjusting means for restricting the amount of axial movement of the piston shaft portion, whereby the suck back amount can be appropriately adjusted and optimized according to various conditions. .

上述した本発明によれば、弁の開閉操作及びサックバック機能をひとつのアクチュエータ（開閉操作部）により実施できるようになり、開閉弁にサックバック機能を備えたサックバックバルブを提供することができる。この結果、開閉弁とサックバック専用バルブとを一体化したサックバックバルブとなるので、設置スペースの低減が可能となり、アクチュエータの同期問題も解消される。
また、ベローズを採用したことにより、サックバック時に大きなストローク量を確保でき、サックバック室の容量のほとんどをサックバック量とすることができるので、フットプリントの増加を抑えつつサックバック可能な液体の容量を増加させることができる。しかも、ベローズがサックバック室を埋めてデッドボリュームをなくすことから、サックバック室における流体の置換性が向上するという効果も得られる。 According to the present invention described above, the opening / closing operation and suck back function of the valve can be performed by one actuator (open / close operation unit), and a suck back valve having a suck back function in the opening / closing valve can be provided. . As a result, a suck-back valve in which the on-off valve and the suck-back dedicated valve are integrated, the installation space can be reduced, and the problem of actuator synchronization can be solved.
In addition, the adoption of the bellows ensures a large stroke amount during suckback and allows the suckback volume to be almost the entire volume of the suckback chamber. The capacity can be increased. In addition, since the bellows fills the suck back chamber and eliminates the dead volume, the effect of improving the fluid replacement property in the suck back chamber is also obtained.

以下、本発明に係るサックバックバルブの一実施形態を図面に基づいて説明する。
図１から図６に示すサックバックバルブＳＶは、薬液等の液体を流す流路に設置され、全閉時の液だれを防止するサックバック機能を備えている開閉弁１０と、開閉操作用のアクチュエータ３０とが一体に構成されている。すなわち、サックバックバルブＳＶは、弁体１１を開閉方向に付勢する弁用のコイルばね（弾性部材）２０を備えた開閉弁１０が、ピストン本体３１及びピストン用のコイルばね（ピストン付勢部材）３２を備えているアクチュエータ（開閉操作部）３０に空気圧（流体圧力）を受けて弁体１１の開閉操作を行うとともに、全閉操作時の液だれを防止するサックバック機能を備えている。
なお、図１〜図６はサックバックバルブＳＶの各状態を示しており、図１は初期状態、図２は図１のＡ−Ａ断面図、図３は弁体１１が開となる直前の状態、図４は弁体１１を開とした通液状態、図５は弁体１１が閉じたサックバック直前の状態、図６はサックバック状態を示している。 Hereinafter, an embodiment of a suck back valve according to the present invention will be described with reference to the drawings.
The suck back valve SV shown in FIGS. 1 to 6 is installed in a flow path for flowing a liquid such as a chemical solution, and has an on / off valve 10 having a suck back function for preventing dripping when fully closed, The actuator 30 is integrally formed. That is, the suck back valve SV includes a valve body spring (elastic member) 20 for biasing the valve body 11 in the opening / closing direction, and the on-off valve 10 includes a piston body 31 and a coil spring for piston (piston biasing member). ) The actuator (opening / closing operation unit) 30 having 32 is subjected to air pressure (fluid pressure) to open and close the valve body 11 and has a suck back function for preventing dripping during the fully closing operation.
1 to 6 show the respective states of the suck back valve SV, FIG. 1 is an initial state, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a state immediately before the valve body 11 is opened. 4 shows a liquid passing state with the valve body 11 opened, FIG. 5 shows a state immediately before the suck back when the valve body 11 is closed, and FIG. 6 shows a suck back state.

開閉弁１０の基本構成は、バルブ本体（ケーシング）１２に流体入口１３及び流体出口１４を備え、バルブ本体１２の内部空間１５には流体流路１６を開閉する弁体１１が配設されている。流体流路１６の上方には、流体流路１６を介して内部空間１５と連通するサックバック室１７が形成されている。このサックバック室１７は、開閉弁１０内において液体を流す流路（以下、「弁内流路」と呼ぶ）の一部となるが、サックバック室１７の底面に凹部１８を形成し、この凹部１８を流体出口１４に連通する出口流路の一部として利用することが望ましい。
なお、上述した凹部１８については、たとえば図７に変形例として示すサックバックバルブＳＶ′のように、サックバック室１７を弁内流路の一部として利用し、すなわち、サックバック室１７を流体出口１４に連通する出口流路の一部として利用することで凹部１８のない構成としてもよい。 The basic structure of the on-off valve 10 is that a valve body (casing) 12 includes a fluid inlet 13 and a fluid outlet 14, and a valve body 11 that opens and closes a fluid flow path 16 is disposed in an internal space 15 of the valve body 12. . A suck-back chamber 17 communicating with the internal space 15 via the fluid channel 16 is formed above the fluid channel 16. The suck back chamber 17 is a part of a flow path (hereinafter referred to as “in-valve flow path”) through which liquid flows in the on-off valve 10, and a recess 18 is formed on the bottom surface of the suck back chamber 17. It is desirable to use the recess 18 as a part of the outlet channel that communicates with the fluid outlet 14.
For the recess 18 described above, the suck back chamber 17 is used as a part of the flow path in the valve, for example, as a suck back valve SV ′ shown as a modification in FIG. 7, that is, the suck back chamber 17 is used as a fluid. By using it as a part of the outlet channel communicating with the outlet 14, a configuration without the recess 18 may be adopted.

上述した弁体１１は、後述するアクチュエータ３０の動作によりサックバック室１７内を軸方向（上下方向）へ移動する開閉押圧部材４０から押圧を受けることにより、内部空間１５内を上下方向へ移動して開閉弁１０内に形成された流体流路１６を開閉する。内部空間１５の上端部には、換言すれば、流体流路１６の入口部には、シート部１９が設けられている。そして、この開閉弁１０においては、弁体１１が上方へ動作してシート部１９に密着すると流体流路１６を閉じ、弁体１１が下方へ移動してシート部１９から離間すると流体流路１６を開く。   The valve body 11 described above moves up and down in the internal space 15 by receiving pressure from the opening and closing pressing member 40 that moves in the suck back chamber 17 in the axial direction (up and down direction) by an operation of an actuator 30 described later. The fluid channel 16 formed in the on-off valve 10 is opened and closed. In other words, the seat portion 19 is provided at the upper end portion of the internal space 15, in other words, at the inlet portion of the fluid flow path 16. In the on-off valve 10, the fluid passage 16 is closed when the valve body 11 moves upward and comes into close contact with the seat portion 19, and the fluid passage 16 is moved when the valve body 11 moves downward and separates from the seat portion 19. open.

開閉弁１０内に形成された弁内流路は、開閉弁１０内の流れ方向から順に、流体入口１３、入口流路１３ａ、内部空間１５、流体流路１６、サックバック室１７の底面に形成された凹部１８、出口流路１４ａ及び流体出口１４に配列されている。
また、図示の開閉弁１０において、図中の符号２１は弁体１１と一体のダイヤフラム、２２は弁体１１の下端部に連結されてコイルばね２０から上向きの付勢を受ける基部、２３は排気流路である。なお、弁体１１の下部を絞って小径にしているので、ダイヤフラム２１を小径化することができる。 The in-valve channel formed in the on-off valve 10 is formed on the bottom surface of the fluid inlet 13, the inlet channel 13a, the internal space 15, the fluid channel 16, and the suck back chamber 17 in order from the flow direction in the on-off valve 10. The recessed portion 18, the outlet channel 14 a and the fluid outlet 14 are arranged.
In the illustrated on-off valve 10, reference numeral 21 in the drawing is a diaphragm integral with the valve body 11, 22 is a base connected to the lower end of the valve body 11 and receives upward bias from the coil spring 20, and 23 is an exhaust. It is a flow path. In addition, since the lower part of the valve body 11 is squeezed to have a small diameter, the diameter of the diaphragm 21 can be reduced.

上述したサックバック室１７には、後述するアクチュエータ３０の動作に連動する開閉押圧部材４０が配設されている。この開閉押圧部材４０は、サックバック室１７の内部を軸方向に移動するピストン軸部３３に連結されて一体に動作し、弁体１１の開閉動作及びサックバック機能に関与する。サックバック室１７内を軸方向に移動して弁体１１を押圧する開閉押圧部材４０とピストン本体３１との間を連結しているピストン軸部３３は、下端部が開閉押圧部材４０に連結されるとともに、上端部がバルブ本体１２等のケーシングに支持されているベローズ４１の内部に収納されている。すなわち、ベローズ４１は、ピストン軸部３３を内部に収納することにより、開閉操作部のアクチュエータ３０を開閉弁１１の弁内流路を流れる流体から分離している。   In the suck back chamber 17 described above, an opening / closing pressing member 40 that is interlocked with the operation of an actuator 30 described later is disposed. The opening / closing pressing member 40 is connected to the piston shaft portion 33 that moves in the axial direction inside the suck back chamber 17 and operates integrally, and is involved in the opening / closing operation and suck back function of the valve body 11. The piston shaft portion 33 that connects between the piston main body 31 and the opening / closing pressing member 40 that moves in the suck back chamber 17 in the axial direction and presses the valve body 11 has a lower end portion connected to the opening / closing pressing member 40. In addition, the upper end portion is housed in a bellows 41 supported by a casing such as the valve body 12. That is, the bellows 41 separates the actuator 30 of the opening / closing operation part from the fluid flowing through the in-valve flow path of the opening / closing valve 11 by housing the piston shaft part 33 therein.

アクチュエータ３０は、アクチュエータ本体（ケーシング）３４に形成された内部空間のシリンダ部３５内に配置されたピストン本体３１を備えている。図示の構成例では、ピストン本体３１により分割されたシリンダ部３５の上部に連通するよう設けた空気圧供給口３６から空気圧を供給し、ピストン本体３１を押し下げて開閉弁１０の開操作を行うように構成されている。   The actuator 30 includes a piston body 31 disposed in a cylinder portion 35 in an internal space formed in an actuator body (casing) 34. In the illustrated configuration example, air pressure is supplied from an air pressure supply port 36 provided so as to communicate with the upper portion of the cylinder portion 35 divided by the piston main body 31, and the piston main body 31 is pushed down to open the on-off valve 10. It is configured.

上述したピストン３１は、コイルばね３２から上向き（弁体１１が閉の方向）の付勢を常時受けており、従って、図示の開閉弁１０は空気圧の供給がない状態で常時閉のノーマルクローズ型となる。すなわち、弁体１１は、コイルばね２０から上向きの付勢を受けて常時閉の状態にあるが、空気圧供給口３６から空気圧を供給してピストン本体３１を下向きに押圧すると、コイルばね３２の付勢に打ち勝ってピストン軸部３３を介して連結された開閉押圧部材４０が降下し、さらに、この開閉押圧部材４０がコイルばね２０の付勢に打ち勝って弁体１１を押し下げる。このとき、たとえば図４に示すように、ベローズ４１は縮んだ状態から引き伸ばされ、弁体１１はシート部１９から離間して開状態となる。
なお、空気圧供給口３６の空気圧供給を停止すると、ピストン３１による下向きの押圧力がなくなるので、たとえば図６に示すように、開閉押圧部材４０はコイルばね３２の付勢を受けて弁体１１から離間し、さらに、弁体１１はコイルばね２０の付勢を受けてシート部１９に密着する閉状態となる。 The above-described piston 31 is always urged upward by the coil spring 32 (the direction in which the valve body 11 is closed). Therefore, the illustrated on-off valve 10 is normally closed in a normally closed state without supply of air pressure. It becomes. That is, the valve body 11 is normally closed by receiving an upward bias from the coil spring 20. However, when the air pressure is supplied from the air pressure supply port 36 and the piston body 31 is pressed downward, the valve spring 11 is attached. The opening / closing pressing member 40 that overcomes the force and is connected via the piston shaft portion 33 is lowered, and the opening / closing pressing member 40 overcomes the bias of the coil spring 20 and pushes down the valve body 11. At this time, for example, as shown in FIG. 4, the bellows 41 is stretched from the contracted state, and the valve body 11 is separated from the seat portion 19 and is opened.
When the air pressure supply from the air pressure supply port 36 is stopped, the downward pressing force by the piston 31 disappears. Therefore, for example, as shown in FIG. Further, the valve body 11 is in a closed state in which the valve body 11 is urged by the coil spring 20 and is in close contact with the seat portion 19.

また、上述したアクチュエータ３０は、後述するサックバック機能について、ピストン本体３１と一体に動作するピストン軸部３３の軸方向動作量を規制するサックバック量調整手段を備えている。このサックバック整量調整手段は、たとえばハンドル３７の操作により軸方向へ移動する螺合軸３８であり、先端部３８ａがシリンダ部３５内へ突出する量（軸方向長さ）の調整を可能とするものである。すなわち、先端部３８ａがシリンダ部３５内へ突出する量を増せば、ピストン本体３１が上昇可能となる範囲（ピストンストローク）が減少するので、開閉押圧部材４０の動作量（移動量）によって定まるサックバック量（サックバック室１７の容積変化量）も減少する。   Moreover, the actuator 30 mentioned above is provided with the suck back amount adjustment means which regulates the axial direction operation amount of the piston shaft part 33 which operate | moves integrally with the piston main body 31 about the suck back function mentioned later. The suck back adjustment amount adjusting means is, for example, a screw shaft 38 that moves in the axial direction by the operation of the handle 37, and can adjust the amount (the length in the axial direction) of the tip portion 38a protruding into the cylinder portion 35. To do. That is, if the amount by which the tip portion 38a protrudes into the cylinder portion 35 is increased, the range (piston stroke) in which the piston main body 31 can be raised is reduced, so The back amount (volume change amount of the suck back chamber 17) also decreases.

続いて、ピストン本体３１及びピストン軸部３３と弁体１１との間に位置し、アクチュエータ３０の動作により開閉弁１０の弁体１１を開閉させる部材である開閉押圧部材４０について説明する。
この開閉押圧部材４０は、ピストン本体３１の下面側に設けられたピストン軸部３３の下端部に結合され、下端面には弁体１１の上部に設けられた弁体凸部１１ａと係合する凹部４０ａを備えている。この開閉押圧部材４０は、サックバック室１７の内径と略同じ外径を有しており、さらに、サックバック室１７は、開閉押圧部材４０及びベローズ４１により、アクチュエータ３０と完全に分離されているので、弁体１１が流体流路１６を閉じた状態では、開閉押圧部材４０の上昇移動によりサックバック室１７の容積を増すと、流体出口１４からサックバック室１７内へ向けた吸引力が発生する。なお、アクチュエータ３０は、ピストン本体３３の下部でベローズ４１の伸縮等に応じて生じる容積変化に対応するため、大気と連通する吸排気口３９を設けてスムーズな動作を可能にしている。 Next, the opening / closing pressing member 40 that is located between the piston body 31 and the piston shaft portion 33 and the valve body 11 and opens and closes the valve body 11 of the opening / closing valve 10 by the operation of the actuator 30 will be described.
The opening / closing pressing member 40 is coupled to the lower end portion of the piston shaft portion 33 provided on the lower surface side of the piston body 31, and engages with the valve body convex portion 11 a provided on the upper portion of the valve body 11 on the lower end surface. A recess 40a is provided. The opening / closing pressing member 40 has an outer diameter substantially the same as the inner diameter of the suck back chamber 17, and the suck back chamber 17 is completely separated from the actuator 30 by the opening / closing pressing member 40 and the bellows 41. Therefore, in a state where the valve body 11 closes the fluid flow path 16, if the volume of the suck back chamber 17 is increased by the upward movement of the opening / closing pressing member 40, a suction force from the fluid outlet 14 toward the suck back chamber 17 is generated. To do. Note that the actuator 30 is provided with an intake / exhaust port 39 communicating with the atmosphere to enable a smooth operation in order to cope with a volume change caused by expansion / contraction of the bellows 41 at the lower portion of the piston body 33.

このように、本発明のサックバックバルブＳＶは、開閉弁１０の弁内流路に形成したサックバック室１７と、サックバック室１７内を軸方向に移動して弁体１１を押圧する開閉押圧部材４０とピストン本体３１との間を連結しているピストン軸部３３と、ピストン軸部３３を内部に収納して開閉操作部のアクチュエータ３０を弁内流路から分離し、一端が開閉押圧部材４０に連結されるとともに他端がケーシング１２に支持されているベローズ４１とを備えている。そして、このサックバックバルブＳＶは、弁体１１の閉動作時において、ピストン軸部３３がピストン本体３１及び開閉押圧部材４０とともに弁体１１の全閉位置まで移動する閉弁動作段階と、ピストン軸部３３及び開閉押圧部材４０が弁体１１の全閉位置からさらに移動してサックバック室１７の空間容積を増すサックバック動作段階との二段階動作を行うように構成されている。   As described above, the suck back valve SV of the present invention includes the suck back chamber 17 formed in the valve flow path of the opening / closing valve 10 and the opening / closing press for moving the inside of the suck back chamber 17 in the axial direction and pressing the valve body 11. Piston shaft part 33 connecting between member 40 and piston body 31, and piston shaft part 33 are housed inside to separate actuator 30 of the opening / closing operation part from the flow path in the valve, one end being an opening / closing pressing member 40 and a bellows 41 connected to the casing 12 at the other end. The suck back valve SV includes a valve closing operation stage in which the piston shaft 33 moves to the fully closed position of the valve body 11 together with the piston main body 31 and the opening / closing pressing member 40 when the valve body 11 is closed, and the piston shaft The part 33 and the opening / closing pressing member 40 are further moved from the fully closed position of the valve body 11 to perform a two-stage operation including a suck-back operation stage that increases the space volume of the suck-back chamber 17.

このように構成されたサックバックバルブＳＶは、弁体１１の閉動作時において、ピストン軸部３３がピストン本体３１及び開閉押圧部材４０とともに弁体１１の全閉位置まで移動する閉弁動作段階と、ピストン軸部３３及び開閉押圧部材４０が全閉位置からさらに移動してサックバック室１７の空間容積を増すサックバック動作段階との二段階動作を行うようにしたので、ひとつのアクチュエータ３０で開閉弁１０の開閉及び液だれ防止のサックバックを行うことができる。
そして、サックバック室１７の空間容積を増すサックバック動作段階では、開閉弁１０で取り扱う液体からアクチュエータ３０を分離しているベローズ４１が軸方向の大きな伸縮機能を有しているので、ピストン軸部３３及び開閉押圧部材４０が軸方向に移動するストローク量（移動量）を容易に確保して空間容積の増加量を増すことができる。 The suck back valve SV configured as described above has a valve closing operation stage in which the piston shaft portion 33 moves to the fully closed position of the valve body 11 together with the piston main body 31 and the opening / closing pressing member 40 when the valve body 11 is closed. Since the piston shaft 33 and the opening / closing pressing member 40 are further moved from the fully closed position to perform the two-stage operation including the suck-back operation stage for increasing the space volume of the suck-back chamber 17, the opening / closing is performed by one actuator 30. The valve 10 can be opened and closed and dripping prevention can be performed.
In the suck back operation stage in which the space volume of the suck back chamber 17 is increased, the bellows 41 separating the actuator 30 from the liquid handled by the on-off valve 10 has a large axial expansion / contraction function. 33 and the opening / closing pressing member 40 can easily secure a stroke amount (movement amount) for moving in the axial direction and increase the amount of increase in the space volume.

すなわち、図１に示す初期状態では、ピストン本体３１は空気圧を受けておらず、ピストン軸部３３及び開閉押圧部材４０はコイルばね３２の付勢により押し上げられ、ベローズ４１は縮んだ状態にある。また、弁体１１は、開閉押圧部材４０が離間して押圧しない状態にあるので、コイルばね２０の付勢により押し上げられてシート部１９に密着した全閉状態にある。
図３は、弁体１１が開となる直前の状態、すなわち弁体１１が全閉位置にあり、ピストン本体３１が空気圧を受けて降下し、ピストン軸部３３及び開閉押圧部材４０を押し下げてベローズ４１は伸びた状態にある。このとき、開閉押圧部材４０は、弁体１１に接する直前か、あるいは、接しても弁体１１を押圧しない位置にある。従って、弁体１１は、開閉押圧部材４０から押圧を受けていない状態にあるので、コイルばね２０の付勢により押し上げられてシート部１９に密着した全閉状態にある。 That is, in the initial state shown in FIG. 1, the piston main body 31 is not receiving air pressure, the piston shaft portion 33 and the opening / closing pressing member 40 are pushed up by the bias of the coil spring 32, and the bellows 41 is in a contracted state. In addition, the valve body 11 is in a fully closed state in which the opening / closing pressing member 40 is not separated and pressed, and is pushed up by the biasing force of the coil spring 20 and is in close contact with the seat portion 19.
FIG. 3 shows a state immediately before the valve body 11 is opened, that is, the valve body 11 is in a fully closed position, the piston main body 31 is lowered by receiving air pressure, and the piston shaft portion 33 and the opening / closing pressing member 40 are pushed down to bellows. 41 is in an extended state. At this time, the opening / closing pressing member 40 is immediately before contacting the valve body 11 or at a position where it does not press the valve body 11 even if the opening / closing pressing member 40 contacts. Therefore, the valve body 11 is in a state of not being pressed by the opening / closing pressing member 40, and is in a fully closed state in which the valve body 11 is pushed up by the bias of the coil spring 20 and is in close contact with the seat portion 19.

図３に示す弁開直前の状態からさらに空気圧の供給を継続すると、図４に示すように、弁体１１を開とした通液状態となる。この状態では、開閉押圧部材４０が弁体１１に接して下向きに押圧しているので、弁体１１は、コイルばね２０の付勢に打ち勝って押し下げられ、シート部１９から離間した全開状態にある。このような弁体１１の全開状態では、流体入口１３から流入する液体が、内部空間１５及び流体流路１６を通って流体出口１４から流出する。このとき、サックバック室１７は、伸びた状態のベローズ４１によりデッドボリュームが生じないように略全容積を埋めているので、サックバック室１７内の液体置換性を向上させることができる。
図５は、弁体１１が閉となり、かつ、サックバックを開始する直前の状態（開弁動作段階が完了した状態）であり、実質的には図３と略同じ状況にある。すなわち、ピストン本体３１を押圧する空気圧の供給が停止されたことにより、開閉押圧部材４０の押圧がなくなった弁体１１はコイルばね２０の付勢により全閉位置に戻り、ピストン本体３１は上昇を開始する直前の状態にある。 If the supply of air pressure is further continued from the state immediately before the valve opening shown in FIG. 3, the liquid passing state with the valve body 11 opened as shown in FIG. In this state, since the opening / closing pressing member 40 is pressed downward in contact with the valve body 11, the valve body 11 is pushed down by overcoming the bias of the coil spring 20, and is in a fully open state separated from the seat portion 19. . In such a fully opened state of the valve body 11, the liquid flowing in from the fluid inlet 13 flows out from the fluid outlet 14 through the internal space 15 and the fluid flow path 16. At this time, since the suck-back chamber 17 is filled with substantially the entire volume so that a dead volume is not generated by the extended bellows 41, the liquid replacement property in the suck-back chamber 17 can be improved.
FIG. 5 shows a state immediately before the valve body 11 is closed and the suck back is started (a state in which the valve opening operation stage is completed), which is substantially the same as FIG. That is, when the supply of air pressure for pressing the piston body 31 is stopped, the valve body 11 that is no longer pressed by the opening / closing pressing member 40 returns to the fully closed position by the bias of the coil spring 20, and the piston body 31 is raised. It is in the state just before starting.

図６は、弁体１１の全閉後にサックバックを開始した状態（サックバック動作段階）を示しており、図中に想像線で示すように、開閉押圧部材４０がコイルばね３２の付勢を受けて瞬時に上昇する。この結果、サックバック室１７は、容積が急激に増加することにより負圧を生じ、流体出口１４及び出口流路１４ａに残存していた流体を吸引して液だれを防止する。このとき、ベローズ４１が縮むことにより、開閉押圧部材４０には大きなストロークを与えることができ、従って、サックバック室１７の略全容積をサックバックに使用できるとともに、サックバック時におけるサックバック室１７の容量変化を大きくすることができる。
このようなサックバック室１７の容量変化増大は、サックバック可能な液体量を増し、液だれを確実に防止することができる。しかも、ベローズ４１を採用したため、フットプリントの増加を抑えつつサックバック量の大容量化を実現している。 FIG. 6 shows a state (suck back operation stage) in which suck back is started after the valve body 11 is fully closed. As shown by an imaginary line in the figure, the opening / closing pressing member 40 biases the coil spring 32. Receives and rises instantly. As a result, the suck-back chamber 17 generates a negative pressure due to a sudden increase in volume, and sucks the fluid remaining in the fluid outlet 14 and the outlet channel 14a to prevent dripping. At this time, the bellows 41 is contracted, so that a large stroke can be given to the opening / closing pressing member 40. Therefore, almost the entire volume of the suck back chamber 17 can be used for suck back, and the suck back chamber 17 during suck back is used. The capacity change of the can be increased.
Such an increase in the capacity change of the suck back chamber 17 increases the amount of liquid that can be sucked back, and can reliably prevent dripping. In addition, since the bellows 41 is employed, an increase in the amount of suck back is realized while suppressing an increase in footprint.

また、弁体１１の下流側に形成される弁内流路の出口流路は、流体がサックバック室１７の底面に形成した凹部１８を通るようにしたので、図４に示す通液状態においては、弁内流路を流れる流体がサックバック室１７を通ることなく流体出口１４へ流出する。従って、サックバック室１７には、図５に示す弁体１１の閉動作時に液体が残留するようなデッドスペース（出口流路１４ａより低い凹部）は存在しないこととなる。すなわち、サックバック室１７内の液体は、最も低い凹部１８を通って流れるので、閉弁後にデッドスペースに残留した液体が固化して不具合の原因となるようなことはない。
また、ハンドル３７により回動操作可能な螺合軸３８によりピストン軸部３３の軸方向動作量を規制するサックバック量調整手段を備えているので、サックバックバルブＳＶを設置する流体流路の諸条件に応じて、サックバック量を適宜調整して最適化することができる。 Further, since the outlet passage of the in-valve passage formed on the downstream side of the valve body 11 allows the fluid to pass through the recess 18 formed in the bottom surface of the suck back chamber 17, in the liquid passing state shown in FIG. The fluid flowing through the valve flow path flows out to the fluid outlet 14 without passing through the suck back chamber 17. Therefore, the suck back chamber 17 does not have a dead space (a recessed portion lower than the outlet flow path 14a) in which liquid remains when the valve body 11 shown in FIG. 5 is closed. That is, since the liquid in the suck back chamber 17 flows through the lowest recess 18, the liquid remaining in the dead space after the valve is closed does not cause a problem.
Further, since a suck back amount adjusting means for restricting the axial movement amount of the piston shaft portion 33 by the screw shaft 38 that can be rotated by the handle 37 is provided, various fluid flow paths for installing the suck back valve SV are provided. Depending on conditions, the amount of suckback can be adjusted and optimized as appropriate.

このように、上述した本発明によれば、開閉弁１０の開閉操作及びサックバック機能をひとつのアクチュエータ３０により実施できるようになり、開閉弁１０にサックバック機能を備えた一体構造のサックバックバルブＳＶを提供することができる。この結果、サックバックバルブＳＶの設置スペースを低減することができ、アクチュエータ３０の同期問題も解消することができる。   As described above, according to the present invention described above, the opening / closing operation and suck-back function of the opening / closing valve 10 can be performed by the single actuator 30, and the suck-back valve having an integrated structure in which the opening / closing valve 10 has the suck-back function. SV can be provided. As a result, the installation space of the suck back valve SV can be reduced, and the synchronization problem of the actuator 30 can be solved.

また、ベローズ４１を採用したことにより、サックバック時に大きなストローク量を確保でき、サックバック可能な液体の容量を増加させることができる。この結果、フットプリントの増加を抑えつつ、サックバック可能な液体の容量を増加させたサックバックバルブＳＶとなる。しかも、ベローズ４１がサックバック室１７を埋めてデッドボリュームをなくすため、サックバック室１７における流体の置換性も向上する。
なお、本発明は上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲内において適宜変更することができる。 Further, by employing the bellows 41, a large stroke amount can be secured during suck back, and the volume of liquid that can be sucked back can be increased. As a result, the suck back valve SV is obtained in which the volume of liquid that can be sucked back is increased while suppressing an increase in footprint. Moreover, since the bellows 41 fills the suck back chamber 17 and eliminates the dead volume, the fluid replaceability in the suck back chamber 17 is also improved.
In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably.

本発明に係るサックバックバルブの一実施形態を示す断面図であり、開閉弁が全閉の初期状態を示している。It is sectional drawing which shows one Embodiment of the suck back valve | bulb which concerns on this invention, and has shown the initial state of an on-off valve being fully closed. 図１のＡ−Ａ断面図である。It is AA sectional drawing of FIG. 図１に示したサックバックバルブについて、開閉弁の弁体が開となる直前の状態を示す断面図である。It is sectional drawing which shows the state just before the valve body of an on-off valve opens about the suck back valve shown in FIG. 図１に示したサックバックバルブについて、開閉弁の弁体を開とした通液状態を示す断面図である。FIG. 2 is a cross-sectional view showing a liquid passing state of the suck back valve shown in FIG. 1 with a valve body of an on-off valve opened. 図１に示したサックバックバルブについて、開閉弁の弁体が閉じたサックバック直前の状態を示す断面図である。It is sectional drawing which shows the state just before the suck back which the valve body of the on-off valve closed about the suck back valve shown in FIG. 図１に示したサックバックバルブについて、サックバック状態を示す断面図である。It is sectional drawing which shows a suck back state about the suck back valve | bulb shown in FIG. 本発明に係るサックバックバルブの変形例を示す断面図であり、開閉弁の弁体が開となる直前の状態を示す断面図である。It is sectional drawing which shows the modification of the suck back valve which concerns on this invention, and is sectional drawing which shows the state just before the valve body of an on-off valve opens.

符号の説明Explanation of symbols

１０ 開閉弁
１１ 弁体
１２ バルブ本体
１３ 流体入口
１３ａ 入口流路
１４ 流体出口
１４ａ 出口流路
１５ 内部空間
１６ 流体流路
１７ サックバック室
１８ 凹部
１９ シート部
２０ コイルばね
３０ アクチュエータ
３１ ピストン本体
３２ コイルばね
３３ ピストン軸部
３７ ハンドル
３８ 螺合部
４０ 開閉押圧部材
４１ ベローズ
ＳＶ，ＳＶ′ サックバックバルブ
DESCRIPTION OF SYMBOLS 10 On-off valve 11 Valve body 12 Valve main body 13 Fluid inlet 13a Inlet flow path 14 Fluid outlet 14a Outlet flow path 15 Internal space 16 Fluid flow path 17 Suck back chamber 18 Recess 19 Seat part 20 Coil spring 30 Actuator 31 Piston main body 32 Coil spring 33 Piston shaft portion 37 Handle 38 Screwed portion 40 Opening / closing pressing member 41 Bellows SV, SV ′ Suck back valve

Claims (3)

弁体を開閉方向に付勢する弾性部材を備えた開閉弁が、ピストン本体及びピストン付勢部材を備えている開閉操作部に流体圧力を受けて弁体開閉操作を行うとともに、全閉操作時の液だれを防止するサックバック機能を備えているサックバックバルブであって、
前記開閉弁の弁内流路に形成したサックバック室と、
前記サックバック室内を軸方向に移動して前記弁体を押圧する開閉押圧部材と前記ピストン本体との間を連結しているピストン軸部と、
前記ピストン軸部を内部に収納して前記開閉操作部を前記弁内流路から分離し、一端が前記開閉押圧部材に連結されるとともに他端がケーシングに支持されているベローズとを備え、
前記弁体の閉動作時には、前記ピストン軸部が前記ピストン及び前記開閉押圧部材とともに前記弁体の全閉位置まで移動する閉弁動作段階と、前記ピストン軸部及び前記開閉押圧部材が前記全閉位置からさらに移動して前記サックバック室の空間容積を増すサックバック動作段階との二段階動作を行うサックバックバルブ。 The on-off valve provided with an elastic member that urges the valve body in the opening / closing direction receives the fluid pressure on the opening / closing operation part provided with the piston body and the piston urging member, and performs the opening / closing operation of the valve body. It is a suck back valve equipped with a suck back function to prevent dripping of
A suck back chamber formed in the flow path in the valve of the on-off valve;
A piston shaft part that connects between the piston main body and an opening / closing pressing member that moves in the suck back chamber in the axial direction and presses the valve body;
The piston shaft portion is housed inside, the opening / closing operation portion is separated from the flow passage in the valve, and one end is connected to the opening / closing pressing member and the other end is supported by the casing,
During the closing operation of the valve body, the piston shaft portion moves to the fully closed position of the valve body together with the piston and the opening / closing pressing member, and the piston shaft portion and the opening / closing pressing member are fully closed. A suck-back valve that performs a two-stage operation including a suck-back operation stage that further moves from the position to increase the space volume of the suck-back chamber. 前記弁体の下流側に形成される前記弁内流路の出口流路が、前記サックバック室の底面に形成した凹部を通る請求項１に記載のサックバックバルブ。   2. The suck back valve according to claim 1, wherein an outlet flow path of the in-valve flow path formed on the downstream side of the valve body passes through a recess formed in a bottom surface of the suck back chamber. 前記ピストン軸部の軸方向動作量を規制するサックバック量調整手段が設けられている請求項１または２に記載のサックバックバルブ。   The suck back valve according to claim 1 or 2, wherein a suck back amount adjusting means for restricting an axial movement amount of the piston shaft portion is provided.
JP2008209762A 2008-08-18 2008-08-18 Suck back valve Active JP5247298B2 (en)

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JP2008209762A JP5247298B2 (en) 2008-08-18 2008-08-18 Suck back valve
EP09167283.2A EP2157343B1 (en) 2008-08-18 2009-08-05 Suck-back valve
KR1020090074074A KR101555382B1 (en) 2008-08-18 2009-08-12 - Suck-back valve
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EP2157343B1 (en) 2013-05-15
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US8251345B2 (en) 2012-08-28
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KR101555382B1 (en) 2015-09-23
EP2157343A2 (en) 2010-02-24

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